HTHSCI 1G03 Lecture Notes - Lecture 15: Short Circuit, Cerebral Cortex, Limbic System
30 Oct 2018
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Motivation: organized activity that is directed towards a vital goal, which then terminates pursuit of the goal. Hypothalamic involvement (this was also in the notes from last class: decorticate (cut anterior to hypothalamus) response present. This is an example of a transection study: behind hypothalamus, response absent. Aggression induced by electrical stimulation of the brain (esb) When electrical stimulus was planted in midbrain (of bull): could short circuit the rage in a bull. Bull"s aggression ceased instantly when es is activated. When electrical stimulus was planted in hypothalamus (of cat): when es was on, aggression was heightened. Implications: the rage response has distinct components, hypothalamic mediation, the stimulation-induced response is not a fully elaborated rage or well coupled to context. This is why it is termed sham rage. Cerebral cortex: temporal lobe damage, fearless, no aggression, indiscriminate oral behaviour, paul maclean (1949, emotional and visceral system.
